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04277e02d7
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131 lines
3.5 KiB
C
131 lines
3.5 KiB
C
/* Copyright (C) 2001-2019 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Ulrich Drepper <drepper@redhat.com>, 2001.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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#include <netdb.h>
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#include <pthread.h>
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#include <stdlib.h>
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#include <gai_misc.h>
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struct notify_func
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{
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void (*func) (sigval_t);
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sigval_t value;
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};
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static void *
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notify_func_wrapper (void *arg)
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{
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gai_start_notify_thread ();
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struct notify_func *const n = arg;
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void (*func) (sigval_t) = n->func;
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sigval_t value = n->value;
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free (n);
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(*func) (value);
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return NULL;
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}
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int
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__gai_notify_only (struct sigevent *sigev, pid_t caller_pid)
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{
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int result = 0;
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/* Send the signal to notify about finished processing of the request. */
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if (sigev->sigev_notify == SIGEV_THREAD)
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{
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/* We have to start a thread. */
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pthread_t tid;
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pthread_attr_t attr, *pattr;
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pattr = (pthread_attr_t *) sigev->sigev_notify_attributes;
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if (pattr == NULL)
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{
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pthread_attr_init (&attr);
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pthread_attr_setdetachstate (&attr, PTHREAD_CREATE_DETACHED);
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pattr = &attr;
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}
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/* SIGEV may be freed as soon as we return, so we cannot let the
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notification thread use that pointer. Even though a sigval_t is
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only one word and the same size as a void *, we cannot just pass
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the value through pthread_create as the argument and have the new
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thread run the user's function directly, because on some machines
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the calling convention for a union like sigval_t is different from
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that for a pointer type like void *. */
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struct notify_func *nf = malloc (sizeof *nf);
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if (nf == NULL)
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result = -1;
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else
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{
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nf->func = sigev->sigev_notify_function;
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nf->value = sigev->sigev_value;
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if (pthread_create (&tid, pattr, notify_func_wrapper, nf) < 0)
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{
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free (nf);
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result = -1;
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}
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}
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}
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else if (sigev->sigev_notify == SIGEV_SIGNAL)
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/* We have to send a signal. */
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if (__gai_sigqueue (sigev->sigev_signo, sigev->sigev_value, caller_pid)
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< 0)
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result = -1;
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return result;
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}
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void
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__gai_notify (struct requestlist *req)
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{
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struct waitlist *waitlist;
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/* Now also notify possibly waiting threads. */
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waitlist = req->waiting;
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while (waitlist != NULL)
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{
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struct waitlist *next = waitlist->next;
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if (waitlist->sigevp == NULL)
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{
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#ifdef DONT_NEED_GAI_MISC_COND
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GAI_MISC_NOTIFY (waitlist);
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#else
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/* Decrement the counter. */
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--*waitlist->counterp;
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pthread_cond_signal (waitlist->cond);
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#endif
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}
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else
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/* This is part of an asynchronous `getaddrinfo_a' operation. If
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this request is the last one, send the signal. */
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if (--*waitlist->counterp == 0)
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{
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__gai_notify_only (waitlist->sigevp, waitlist->caller_pid);
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/* This is tricky. See getaddrinfo_a.c for the reason why
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this works. */
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free ((void *) waitlist->counterp);
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}
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waitlist = next;
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}
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}
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